Owner Password may contain special chars

Allow owner password field to contain special chars, not only letter and
numbers.
Update docs
* Remove deprecated line about downloading the latest ThinkUp package
* Add email sending to system requirements, closes #1476
Convert to responsive design and add version header to navigation.
Fix docs link in footer

Missing slash = sadness.
Docs: Remove Gina's name, update version, fix broken link
Merge pull request #1539 from mariancvrt/specialcharsTU

On installation, allow password to contain special chars
Prevent multiple account activations

If owner has already activated their account, display a message to that effect.
Closes #1543
Reset Password Token on password update

Restrict owner from changing password multiple times with the same
password token as security measure. Reset the token once the password
has been updated.
Closes #1546